EP 1045614 A1 20001018 - AN ANTI-NOISE-ELECTRET PICK-UP
Title (en)
AN ANTI-NOISE-ELECTRET PICK-UP
Title (de)
ELEKTRET-LÄRMSCHUTZ-SCHALLAUFNAHME
Title (fr)
ENREGISTREUR ANTIBRUIT A ELECTRET
Publication
Application
Priority
- CN 9900097 W 19990721
- CN 98207092 U 19980722
Abstract (en)
A noise canceling pickup with an electret is provided with a cylinder body having a front cover and a rear cover, said front cover is provided with sound passing holes, said cylinder body is provided with an oscillating membrane of the electret, a back electrode sheet and a back electrode base, wherein said cylinder body is composed of a front cylinder body and a rear cylinder body, said oscillating membrane is provided into said front cylinder body, said rear cover of said cylinder body is provided with at least one sound passing hole, and said rear cover is provided with electric elements therein. With the arrangement according to the present invention, the distance between the opposite front and rear sound passing holes can be made smaller. The noise canceling pickup with an electret can be used in the higher frequency band and in a wide frequency range to cancel the noises more effectively. <IMAGE>
IPC 1-7
IPC 8 full level
H04R 1/08 (2006.01); H04R 3/06 (2006.01); H04R 7/16 (2006.01); H04R 19/01 (2006.01)
CPC (source: EP US)
H04R 1/083 (2013.01 - EP US); H04R 19/016 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0005922 A1 20000203; AU 4894999 A 20000214; AU 761224 B2 20030529; CA 2304318 A1 20000203; CN 1165203 C 20040901; CN 1274513 A 20001122; CN 2346131 Y 19991027; EP 1045614 A1 20001018; EP 1045614 A4 20060809; JP 2002521939 A 20020716; US 6757399 B1 20040629
DOCDB simple family (application)
CN 9900097 W 19990721; AU 4894999 A 19990721; CA 2304318 A 19990721; CN 98207092 U 19980722; CN 99801201 A 19990721; EP 99932610 A 19990721; JP 2000561797 A 19990721; US 50929300 A 20000615